Electricity-meter.



D. G JACKSON. ELECTRICITY METER.

APPLICATION FILED FEB. 12, 1906. RENEWED MAY 11, 1910.

962,222. Patented Jim@ 21,1910.

c1se, and exact description,

DUGALD C. JACKSON, OF MADESN,

XVISCN WILLIAM B. JACKSON, OF MAIDSO SIN, AS SlGl\lO-t TO BUG-LD C. JACKSON AND N', NsCNsN, A COPARTNERSHIP.

ELECTRICTY-METER.

Application filed February 12, 1906, Serial No. 300,688.

To all whom it may concern:

Be it known that citizen of the United Madison, in the county of Dane and State of Visconsin, have invented a certain new and useful Improvement in Electricity-Meters, of which the fol-lowing is a full, clear, conreference being had to the accompanying drawings, forming a part of this specification.

My invention relates to electric meters, particularly to wattmeters and its object is to counteract the effect of the yconditions which cause the meters indications to vary with temperature;

The effect of temperature on watt-meter in dications is produced in various ways. One is the change of resistance with variations of temperature. A second is the change of friction with .i change of temperature. Another is the chI ige. of the artificial restraining inoment with change of temperature.v

In the accompanying drawing l have shown my invention applied to an induction meter.

The meter comprises an armature in the form of a dislr 1 and-mounted on a stein 2, which rotates in bearings 3 and l and con- 'nected at its upper end with the counting train 5 in a well known manner. The retarding disk 16 is also carried by the spindle and is spanned bythe retarding magnets 'T and 8. The armature disk revolves between the poles 9-10 and ll-l of the magnetic frames 13 and la.- The current winding 15 is in inductiverelation with the armature shown, and is included in the line limb a. The pressure coils 16h17 are carried by the magnet-ic traine 12, and are connected tcgether and bridged between the line limbs a-'b of the supply circuit fed by 'the alternating current generators. The phase adjusting windings 18 aud 19 are also carried on the frame 13 and are connected together in a closed circuit 20. 'lhe pressure magnetism for the meter may be adjusted so that it has a phase exactly degrees from the phase of the circuit pressure under conditions or" standard temperature, the adjustment being eEected by suitably adjusting the resistance of a resistance coil 21 included in circuit 'with the phase adjusting coils 18 and 19. As the temperature et the meter rises, the restraining moment decreases and the motive torque should therefore be caused to Specification of Letters Patent.

I, DUGALD C. JACKSON, I States, residing at` l l i Patented J une 21, 1910, Renewed May 11, 1910. Serial No. 560,730.

decrease in the same proportion. This may be brought about by constructing the resistance coil 21 ot a material having a suitable temperature coefficient, so that, as the temperature changes, the magnetic field of the pressure coils is permitted to deviate slightly from quadrature with the main line pressure. Since the restraining moment decreases as the temperature rises, the deviation from 90 degrees ought to be in decreasing direction, while the angle ought to become a little greater than 90 degrees as the temperature falls below the standard ternperature. The particular material to use in the composition of the automatically compensating moment resistance must depend upon the particular details of construction which are adopted in the particular meter under. consideration. Copper will ordinarily serve the purpose, although iron wire will in some cases, be preferable and in other cases a material or a lower temperature coel'iicient ray be sufficient to bring about the result. The meter may therefore be so ad. justed that the motive torque automatically changes as the temperature of the4 Ameter changes, the said changes of the motive torque being substantially equal in extent and opposite in sign to the changes or" the restraining moment which are caused by the changes in temperature and the meter indications are thereby caused to be vsubstantially independent of temperature changes.

l claim as new and desire to secure by- Letters Patent* l. ln an electricity meter, the combination with a movable element, of torque producing circuits associated therewith, restraining means for controlling the movement of the movable element', variations in temperature c of the meter causing variations in the restraining effort and in the speed of the inevable element', and additional circuit means associated with the torque producing cir cuits, the temperaturecoetcient of said ad ditionai Ycircuit means being such that the currents in the torque producing circuits are modified and the torque varied in accordance with variations of therestraining effort by the Variations in temperature whereby said movable element may operate independentlyv of temperature variations. i

2. In an electricity meter, the combination 'with a movable element, of a torque pro ducing winding therefor, changes in tern,-

peraturel tending to cause variation in the s ed of the movable element, and anadditional circuit in inductive relation to the torque producing winding havinga temperature coefficient adjusted to influence the current flow through the torque producing 'winding in accordance with said temperature variations whereby the tendencies to speed variation will be counteracted.

3. In an electricity meter, the combination with a movableelement, of shunt and series torque producing circuits therefor, varia- Atorqup'roduced by tions in temperature tending to cause variations in speed of the movable element, and an additional circuit associated with the torque producing circuits having a temperature coeiicient adjusted to influence the current through the torque producing circuits in accordance with said temperature varia'-V tionswhereby tendencies to variation in speed of the movable element will be counteracted by corresponding variations in the the circuits.

4. In an electricity meter, the combination with a movable element, of pressure and current torque producing circuitstherefor, variation in temperature 'tending to cause variation in speed of the movable element,

and an -additional circuit associated with the ressure circuit having its temperature coe cient adjusted to modify the current flow through the pressure winding whereby lthe 'torque is varied to counterbalance tend.-

cuit associated with the windings and mag.

netic circuit, and a heat responsive element in said secondary circuit for changing the current flow therethrough in accordance with changes in temperature whereby the speed is maintained constant.

In witness whereof, I hereunto subscribe my name this eighth day of February A. D., 1906.

DUGAI) C. JACKSON.

Witnesses:

CHARLES J. SoHMiDT, LEONARD W. NovANDim. 

